The superior leviathan ring is a level 85 piece of jewellery from the Eastern Lands, unlocked through player-owned ports. Its name refers to the Leviathan, a dangerous sea monster. It has a unique ability: a 5% chance per attack to reduce the incoming damage of an attack by 50% (rounded up).

The ring can be made at 90 Crafting in the port's workshop, using 100 pearls and giving 10,000 Crafting experience, after collecting the four parts of the leviathan ring eastern scroll. As with all craftable items in the workshop, boosts will not work.

The superior leviathan ring lasts for 100,000 charges of combat (a minimum of around 17 hours) before degrading and requiring repair. It can be repaired by a Repair NPC or at a player-owned house armour stand for coins, or at the Port workbench using pearls. A full recharge costs:

This makes the ring ideal for players taking the tanking role. When the passive activates, it will reduce just the damage that activated it, not all damage taken that tick. A filtered chatbox message is given when the effect activates: The Leviathan ring reduces the damage of this attack by [damage].

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Repairing with pearls costs half a pearl per percentage, rounded up to the nearest integer. For example: If the charge is at 59%, the repair required is 41%. The pearl cost would be 41 divided by 2, or 20.5. This would be rounded up to 21 pearls. Currently, one Pearl is worth 2,347.2 coins coins when making a tradeable leviathan ring, and 6,000 coins coins when used to repair a superior leviathan ring at level 99 Smithing.

Two passive effects: 50% chance of restoring up to 5% adrenaline when a target is killed; teleports the wearer to their respawn point with all of their items when they die, at a cost of 15% charge (effective cost 657,104.7 coins)